Open Water Divers are usually certified to 18 or 20 metres maximum depth. And after completing the Advanced Course, this maximum is increased to 30 metres (99ft.). But some people don’t have enough time or money to do the whole Advanced Course, which takes 2-3 days and five dives. And some diving trips require all the divers to be certified to dive to 30m. The Adventure Deep Dive is an ideal compromise.